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Note 6 - Debt Securities (Tables)

9 Months Ended

Sep. 30, 2021

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

2021:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	138,401			$	350			$	(716	)		$	138,035
U.S. government agencies			110,832				3,172				(436	)			113,568
U.S. government mortgage-backed securities			158,104				1,839				(1,177	)			158,766
State and political subdivisions			271,918				5,429				(695	)			276,652
Corporate bonds			75,154				3,345				(97	)			78,402
		$	754,409			$	14,135			$	(3,121	)		$	765,423
2020:						Gross				Gross
		Amortized				Unrealized				Unrealized				Estimated
		Cost				Gains				Losses				Fair Value
U.S. government treasuries		$	11,725			$	328			$	-			$	12,053
U.S. government agencies			106,337				4,875				(13	)			111,199
U.S. government mortgage-backed securities			146,889				3,337				(31	)			150,195
State and political subdivisions			243,438				8,182				(36	)			251,584
Corporate bonds			67,247				4,722				(1	)			71,968
		$	575,636			$	21,444			$	(81	)		$	596,999

Investments Classified by Contractual Maturity Date [Table Text Block]

		Amortized				Estimated
		Cost				Fair Value
Due in one year or less		$	47,083			$	47,560
Due after one year through five years			353,573				358,552
Due after five years through ten years			321,680				326,523
Due after ten years			32,073				32,788
Total		$	754,409			$	765,423

Schedule of Realized Gain (Loss) [Table Text Block]

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2021				2020				2021				2020
Proceeds from sales of securities available-for-sale		$	622			$	-			$	622			$	5,463
Gross realized gains on securities available-for-sale			24				-				24				430
Gross realized losses on securities available-for-sale			-				-				-				-

Schedule of Unrealized Loss on Investments [Table Text Block]

		Less than 12 Months								12 Months or More								Total
2021:		Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses				Estimated Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government treasuries		$	102,182			$	(716	)		$	-			$	-			$	102,182			$	(716	)
U.S. government agencies			29,722				(436	)			-				-				29,722				(436	)
U.S. government mortgage-backed securities			100,746				(1,177	)			-				-				100,746				(1,177	)
State and political subdivisions			67,527				(672	)			896				(23	)			68,423				(695	)
Corporate bonds			9,378				(97	)			-				-				9,378				(97	)
		$	309,555			$	(3,098	)		$	896			$	(23	)		$	310,451			$	(3,121	)

		Less than 12 Months								12 Months or More								Total
2020:		Fair Value				Unrealized Losses				Fair Value				Unrealized Losses				Fair Value				Unrealized Losses
Securities available-for-sale:
U.S. government agencies		$	6,016			$	(7	)		$	896			$	(6	)		$	6,912			$	(13	)
U.S. government mortgage-backed securities			5,097				(31	)			-				-				5,097				(31	)
State and political subdivisions			7,875				(34	)			180				(2	)			8,055				(36	)
Corporate bonds			534				(1	)			-				-				534				(1	)
		$	19,522			$	(73	)		$	1,076			$	(8	)		$	20,598			$	(81	)

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